[2x²-(x+y)(x-y)][(-x-y)(y-x)+2y²]
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[2x²-(x+y)(x-y)][(-x-y)(y-x)+2y²]
=(2x²-x²+y²)[(x+y)(x-y)+2y²]
=(x²+y²)(x²-y²+2y²)
=(x²+y²)²
=(2x²-x²+y²)[(x+y)(x-y)+2y²]
=(x²+y²)(x²-y²+2y²)
=(x²+y²)²
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=[2x^2-(x^2-y^2)][-(y^2-x^2)+2y^2]
=[2x^2-x^2+y^2][-y^+x^2+2y^2]
=[x^2+y^2][x^2+y^2]
=x^4+2x^2y^2+y^4
=[2x^2-x^2+y^2][-y^+x^2+2y^2]
=[x^2+y^2][x^2+y^2]
=x^4+2x^2y^2+y^4
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